RNC Chairwoman Ronna Romney McDaniel (left) and Donald Trump (right). Image via McDaniel’s Facebook.

The Republican National Committee mailed absentee voters in a key battleground state incorrect information about state election law that could result in spoiled ballots, The Washington Post reported Wednesday.

The mailer incorrectly said that absentee ballots postmarked by the election day would be counted if they were received by county clerks within 10 days of the election. Under Montana law, ballots must be turned in by 8 p.m. local time on election day.

Recent polls have shown single-digit races between Sen. Jon Tester (D-MT) and his challenger, Republican State Auditor Matt Rosendale. In the battle for the state’s lone congressional seat, Rep. Greg Gianforte (R-MT) has also polled within single-digits of his Democratic challenger, state Rep. Kathleen Williams.

“We regret the unintentional error we made in a recent mailing,” said RNC spokesman Rick Gorka. “We are contacting all voters who received the mailing through live phone calls and we are sending new mailers to each voter providing clarification.”

“Mailers with incorrect […]